diff --git a/guide/requirements.txt b/guide/requirements.txt
index b3d9af05..ae6ef3b4 100644
--- a/guide/requirements.txt
+++ b/guide/requirements.txt
@@ -2,3 +2,4 @@ sanic>=23.6.*
 sanic-ext>=23.6.*
 msgspec
 python-frontmatter
+mistune